Aminoalkylthiazoles



United States Patent 2,912,357 AMINOALKYL'IHIAZOLES Marion W. Harman and John J. DAmico, Nitro, W. Va., asslgnors to Monsanto Chemical Company, St. Louis, M0., a corporation of Delaware No Drawing. Application March 29, 1956 Serial No. 574,623

12 Claims. (Cl. 167-33) The present invention relates to new chemical products and to the uses of said products as fungicides, especially for control of wheatrust. More particularly, the invention relates to new thiazoles and specifically to a plurality of new derivatives of arylene thiazoles, preferably mercapto arylene thiazoles. In general, the derivatives may be described as aminoalkyl thiazoles. The alkyl group is limited to one containing at least two carbon atoms in a straight chain but it is within the scope of the invention to replace one or more hydrogen atoms by lower alkyl groups. Moreover, one or two hydrogens of the benzene nucleus of the mercaptobenzothiazole nucleus may be replaced by another benzene nucleus or by such substituents as hydrogen, halogen, alkoxy, alkyl or aryl groups. Also, the amino group attached to the alkyl group may be primary, secondary or tertiary.

The new compounds may be most conveniently represented by the general formula (M-XE) A] wherein M represents a carbocyclic thiazole nucleus, X is oxygen or sulfur and preferably sulfur, E represents an alkylene group containing at least two carbon atoms in a straight chain and preferably two carbon atoms, A represents the amine group and preferably a dialkylamino group and y and z are integers from 1 to 2. Typical examples of the new compounds comprise 2-(2-dimethylaminoethylthio) 4-ethylbenzothiazole, 2-(2-diethylaminoethylthio) 4-ethylbenzothiazole, 2-(Z-dimethylaminoethylthio) 7-methylbenzothiazole, 2-(Z-diethylaminoethylthio) 7-methylbenzothiazole, 2-(2 dimethylaminoethylthio) 4-methylbenzothiazole, 2-(2-diethylaminoethylthio) 4-rnethylbenzothiazole, 2-(Z-dimethylaminoethylthio) S-methylbenzothiazole, 2-(Z-diethylaminoethylthio) S-methylbenzothiazole, 2-(Z-dimethylaminoethylthiO) fi-methylbenzothiazole, 2-(2-diethylaminoethylthio) 6-methylbenzothiazole, 2-(Z-dimethylaminoethylthio) 4-methyl 5 chlorobenzothiazole, 2-(2-diethylaminoethylthio) 4 methyl 5 chlorobenzothiazole, 2-(2-dimethylaminoethylthio) 4-methyl 6 chlorobenzothiazole, 2-(Z-diethylaminoethylthio) 4 methyl 6 chlorobenzothiazole, 2-(Z-dimethylaminoethylthio) 4-chlorobenzothiazole, 2-(2-diethylaminoethylthio) 4-chlorobenzothi-azole, 2-(Z-dimethylaminoethylthio) 6-chlorobenzothiazole, 2-(Z-diethylaminoethylthio) 6-chlorobenzothiazole, 2-(Z-dimethylaminoethylthio) 6-phenylbenzothiazole, 2-(Z-diethylaminoethylthio) 6-phenylbenzothiazole, 2-(Z-dimethylaminoethylthio) 4-phenylbenzothiazole, 2-(Z-diethylaminoethylthio) 4-phenylbenzothiazole, 2-(Z-dimethylaminoethylthio) 4,5-dimethylbenzothiazole, Z-(Z-diethylanflnoethylthio) 4,5-dimethylbenzothiazole, 2-(Z-dimethylaminoethylthio) 4,6-dimethylbenzothiazole, 2-(Z-diethylaminoethylthio) 4,G-dimethylbenzothiazole, 2-(2-dimethylaminoethylthio) 4-methoxybenzothiazole, 2-(2-diethylaminoethylthio) 4-methoxybenzothiazole, 2-(2-dimethylaminoethylthio) S-methoxybenzothiazole,

2-(Z-diethylaminoethylthio) S-methoxybehzothiazole, 2-(Z-dimethylaminoethylthio) 6-methoxybenzothiazole, 2-(Z-diethylaminoethylthio) 6-methoxybenzothiazole,

2-'(Z-dimethylarrfinoethylthio) 4-methoxy-6-chlorobenzo- Salts of the compounds having the aforedefined structure are also contemplated. The salts are for the most part crystalline, non hygroscopic solids. Typical examples are the salts prepared from any of the following acids: hydrochloric acid, sulfuric acid, oxalic acid, phthalic acid, benzoic acid, oleic aid, stearic acid, adipic acid and maleic acid. The method of producing the various products of the invention and the application of the products as fungicides will be understood from the following description and examples. In order to aid in describing and understanding the invention, the various products will be arranged in classes.

CLASS l.NON-SUBSTITUTED BENZENE NUCLEUS Example 1 2 (2 dimethylaminoethylthio)benzothiazole of the structure CS CHgCHzN(CH3)g was obtained as follows: To a vessel equipped with agitating means, 216 parts (0.5 mole) of a solution of a 38.7% concentration of sodium mercaptobenzothiazole was introduced and to this were added 72 parts (0.5 mole) of 2-chloro N,N-dimethylethylamine hydrochloride and parts (0.5 mole) of a 25% solution of caustic soda. The stirred mixture was then heated for 5 hours at about 50-60 C. and then cooled to about 25 C. Thereupon the mixture was extracted with about 500 parts of diethyl ether, the ether extract was washed with five successive portions of water, each of about 200 parts, or until the wash waters were neutral in reaction. The ethereal solution was then dried by suitable means, such as anhydrous sodium sulfate and the ether removed under a vacuum of 1-2 mm. pressure. An amber colored liquid was obtained which was insoluble in water and heptane but soluble in ether, acetone, chloroform, ethanol, ethyl acetate and hot benzene. Analysis gave 11.86% nitrogen and 27.36% sulfur as compared to 11.75% nitrogen and 26.90% sulfur calculated for 11 14 2 2- Example 2 2-( 1-methyl-2-dimethylaminoethylthio) benzothiazole of the structure parts (0.5 mole) of 25% caustic soda solution. The

final product obtained again was an amber oil possessing the same solubility characteristics as the product of the first example and analyzing 11.07% nitrogen as compared to 11.10% calculated for C H -N s Example 3 2-(2-diethylaminoethylthio)benzothiazole of the structure was obtained by following the detailed procedure set forth in Example 1 but employing as a reaction charge 496 parts (0.5 mole) of a 17.05% solution of sodium mercaptobenzothiazole, 86 parts (0.5 mole) of 2-chloro- N,N-diethylethylamine hydrochloride and 80 parts (0.5 mole) of 25% caustic soda solution. An amber colored liquid product was obtained possessing the same solubility characteristics as the product of Example 1. Analysis gave 10.50% nitrogen and 23.69% sulfur as compared to' 10.52% nitrogen and 24.07% sulfur calculated for C H S The hydrochloride of this example was a cream colored solid melting at 186 C. after recrystallization from methanol. M.P. (HOOC) .2H O salt 140- 142 C.

Example 4 2-(3 dimethylaminopropylthio)benzothiazole of the structure CSCHzCHzCHgN(CHs)2 e Example 5 2,2 bis(2 dimethylaminoethylthio.) 6*,6 dibenzothiazole of the structure (onmNoHzoms o was obtained by reacting 33.2 parts (0.1 mole) of 2,2-

dimercapto-6,6'-dibenzothiazole dissolved in 500 ml. of

water containing 32 parts (0.2 mole) of 25% caustic soda solution with 28.8 parts (0.2 mole) of 2-chloro N,N-dimethylethylamine hydrochloride in 32 parts (0.2 mole) of 25 caustic soda solution. The stirred mixture was then heated for 4 hours at 5060 C., cooled to 25 C., the precipitate filtered, washed with water until neutral to litmus and air dried at room temperature. The product was a tan solid which melted, after recrystallization from dilute alcohol, at 126428 C. Analysis gave 11.21% nitrogen and 26.63% sulfur as compared to 11.80% nitrogen and 27.01% sulfur calculated for C H N S "his compound controlled Stemphylium sarcirmeforme and Monilim'a fructicola but 4. was not effective against the organism causing wheat rust.

Example 6 2-(3-aminopropylthio)benzothiazole of the structure G S (0 Hz) aNHa was obtained by employing as a reaction charge 246 parts (0.25 mole) of a 16.98% solution: of sodium mercaptobenzothiazole, 54.7 parts (0.25 mole) of 3- bromopropylamine hydrobromine and 40 parts (0.25 mole) of 25 caustic soda. The procedure was that followed in Example 1 except that after cooling to 25 C. the reaction mixture was extracted with 300 ml. of

chloroform. The chloroform solution was Washed with. water until the washings were neutral to litmus and'dried' over sodium sulfate. The chloroform was removed in vacuo at 90 C. The product was a cream colored solid'melting at C. Analysis gave 11.95% nitrogen as compared to 12.49% calculated for C H N S Example 7 2-(Z-aminoethylthio)benzothiazole of. the: structure soda solution. The reaction mixture was stirred at 25-- 30 C. for 24 hours, 200 ml. of ethyl ether then added and stirring continued for 30 minutes whereupon the product was filtered, washed with water until neutral to.

litmus and air dried at room temperature. Atan colored solid was obtained melting at -177 C. after recrystal lization from methyl alcohol. Analysis gave 12.73% nitrogen and 30.63% sulfur as compared to 13.32% nitrogen and 30.49% sulfur calculated for CQHiQNzSZ:

Example 8' 2,2-(iminodiethylene)dithiobis(benzothiazole) of the structure osornom NH 2 was formed by reacting 392 parts (0.4 mole) of a.17;05'% solution of sodium mercaptobenzothiazole in 32 parts (0.2 mole) of 25% caustic soda solutionwith 35.7 parts (0.2 mole) of di(2-chlorethyl)arnine hydrochloride at a temperature of 50-60 C. for about 3 hours.

neutral to litmus and then allowed to dry at room temperature. Tan colored crystals melting at 47-50 C. were obtained. The crystals. were soluble in hot chloroform and hot benzene but. were insoluble-in other common solvents. Analysisgave 9.93% 30.32%: sulfur compared to'10.41% nitrogen and. 31.78% sulfur calculated for C Hi N S of tomato wiltand tomatqleaf spot respectively.

After cooling to about 10 C., the precipitate wasseparated: by filtration, washed with water until the washings were nitrogen. and

Although; not a rust eradicant, thecompound was active. against Fusariumfl lycopersz'ci and;Stemphylium solani, the. causative agents- Example 9 '2-(2-diethylaminoethoxy)benzothiazole of the structure was obtained by reacting 60.5 parts (0.4 mole) of 2- hydroxy benzothiazole dissolved in 500 ml. of water containing 64 parts (0.4 mole) of 25% caustic soda solution with 68.9 parts (0.4 mole) of 2-chloro N,N-diethylethylamine hydrochloride in 64 parts (0.4 mole) of 25 caustic soda solution. The stirred reaction mixture was Example 10 Z-(Z-dimethylaminoethoxy)benzothiazole of the structure was obtained by employing the reaction charge of Example 9 except that 57.6 parts (0.4 mole) of 2-chloro N,N-dimethylethylamine hydrochloride was substituted for the 2-chloro N,N-diethylethylamine hydrochloride. The stirred reaction mixture was heated at 7080 C. for 18 hours and then placed in a drying oven at 60 C. to remove water. The residue was filtered hot and the filtrate heated at 80-90 C. in vacuo (1-2 mm.) for 3 hours. The produce was an amber oil analyzing 14.47% sulfur as compared to 14.42% calculated for C I-I N OS. This compound controlled Fusarium lycopersici and Stemphylium solani but was not a rust eradicant.

Example 11 2 (3 dimethylaminopropoxy)benzothiazole of the structure was obtained by reacting 30.0 parts (0.2 mole) of 2- hydroxy benzothiazole dissolved in 250 ml. of SD1 alcohol containing 13.2 parts (0.2 mole) of 85% potassium hydroxide and 20 ml. of water with 31.6 parts (0.2 mole) of gamma-dimethylaminopropyl chloride hydrochloride dissolved in 20 ml. of water containing 13.2 parts (0.2 mole) of 85% potassium hydroxide. The stirred reaction mixture was heated at 7580 C. for 24 hours, cooled to 25 C. and 500 ml. of water added. After stirring for an additional half hour, the mixture was extracted with 500 ml. of chloroform, the chloroform extract washed with water until neutral to litmus and dried over sodium sulfate. The chloroform was removed in vacuo at 80-90 C. The amber oil so obtained analyzed 11.44% nitrogen and 13.90% sulfur as compared to 11.85% nitrogen and 13.57% sulfur calculated for 6 CLASS 2.HALOGEN SUBSTITUTED BENZENE NUCLEUS I Example 12 S-chloro-Z-(Z-dimethylaminoethylthio)benzothiazole of the structure was obtained by reacting parts (0.465 mole) of 5- chloromercaptobenzothiazole dissolved in 500 parts of Water containing 74.5 parts (0.465 mole) of 25 caustic soda with 67 parts (0.465 mole) of 2-chloro-N,N-dimethylethylamine hydrochloride in 74.5 parts (0.465 mole) of 25% caustic soda solution. The procedure followed was the same as described in Example 8. A tan colored solid melting at 46-48 C. was obtained which was insoluble in water but soluble in the ordinary organic solvents. Analysis gave 10.96% nitrogen and 13.80% sulfur as compared to 10.27% nitrogen and 13.00% sulfur calculated for C H ClN S Example 13 5-chloro-2- 2 diethylaminoethylthio) benzothiazole of the structure CSCH:CHgN(Cz a)l 01 M was obtained by following the procedure of Example 1 but using as a charge 50.4 parts (0.25 mole) of 5-chloro- Z-mercaptobenzothiazole in 500 parts of water contain- 5 chloro 2 (1 methyl 2 dimethylaminoethylthio) benzothiazole of the structure CSCHCHIN(CH;) 01 H was produced by following the procedure described in Example 8 by reacting 50.4 parts (0.25 mole) of 5-chloro- Z-mercaptobenzothiazole in 500 parts of water containing 40 parts (0.25 mole) of 25% caustic soda solution with 39.5 parts (0.25 mole) of 2-chloro-1-methyl-N,N- dimethylethylamine hydrochloride in 40 parts (0.25 mole) of 25 caustic soda solution. The product was a tan colored solid melting at 6566 C. and was insoluble in water and heptane but soluble in the commonly used organic solvents. Analysis gave 9.84% nintrogen and 12.33% chlorine as compared to 9.77% nitrogen and 12.36% chlorine calculated for C H ClN S Example 15 2 (2 aminoethylthio) 5 chlorobenzothiazole of the structure was obtained by the procedure of Example 7 whileemploying as a reaction charge 40.3 parts (0.2 mole) of -chloro-2-mercaptobenzothiazole in 200 parts of water containing 32 parts (0.2 mole) of caustic. soda solu tion and 41' parts (0.2 mole) of 2-bromoethylamine hydrobromide in 32 parts (0.2 mole) of 25 caustic soda solution. The product was a tan colored solid melting at 173175 C. after recrystallization from ethyl alcohol. It was insoluble in water, ether and heptane but soluble in hot solvents such as acetone, benzene, chloroform, ethanol and ethyl acetate. Analysis of the product gave 10.99% nitrogen and 14.82% chlorine as compared to 11.44% nitrogen. and 14.49% chlorine calculated for C H C1N' S It was active against Monilinia fracticola but was not a rusteradicant.

Examplev 16 5' chloro' 2 (3 dimethylaminopropylthio)benzothiazole of'the structure Example 17 5' -chloro 2 (2 -morpholinoethylthio)benzothiazole ofthe'structure' S oar-on,

CSCHzCHzN o 01 N/ oar-on,

was obtained by reacting 40.3 parts (0.2 mole) of 5- chloro-2-mercaptobenzothiazole in 400 parts of Water containing 32 parts (0.2 mole) of 25% caustic soda solution with 37.2. parts (0.2 mole) of 4-(2-chloroethyl)- morpholine hydrochloride containing 32 parts (02 mole) of 25 caustic soda solution. Again following the procedure in Example 8, the product was a tan solid, M.P. 7677 C. Analysis gave 9.08% nitrogen, 19.96% sulfur and 10.95% chlorine as compared to 8.86% nitrogen, 20.37% sulfur and 11.23% chlorine calculated for is isc z z- Example 18 5 .-chloro-2- Z-dibutylaminoethylthio benzothiazole the structure CSCHQCHQN(C(HQ)Z or N was. produced by reacting 50.4 parts (0.25 mole) of 5-chloro-2-rnercaptobenzothiazole in 250 parts of Water containing 40 parts (0.25 mole) of 25% caustic soda solution with 57.1 parts (0.25 mole) of N-(2-chloroethyl)dibutylarnine hydrochloride containing 40 parts (0.25 mole) of 25% caustic soda solution. The stirred reaction mixture was heated at 5060 C. for 3 hours and then cooled to 5 C. The resulting solid was filtered, washed with cold water until the washings were neutral to litmus and air-dried on a porous plate at 1520 C. The tan solid so obtained melted at 32-33 C. after recrystallization from ethyl alcohol. Analysis gave 17.53% sulfur and 10.08% chlorine as compared to 17.97% sulfur. and 9.93%. chlorine calculated. for C17H25C1N2S2.

CLASS 3.-ALKOXY SUBSTITUTED BENZENE NUCLEUS.

6 ethoxy 2 (2 dimethyl'aminoethylthio)benzothiazole, possessingthe structure obtained was an amber oil, insoluble in water and.

heptane but soluble in the common organic solvents. Analysis of the product gave 9.73% nitrogen and 22.21% sulfur as compared to 9.92% nitrogen and 22.71% sulfur calculated for C H N' OS Example 20 6 ethoxy 2.- (1 methyl 2 dimethylaminoethylthio)benzothiazole, possessing the structure osonornmonm was obtained by reacting 73 parts (0.336 mole) of 6 ethoxy mercaptobenzothiazole: in.400 parts of water con-.-

taining 53.8 parts (0.336 mole) of 25% caustic soda solution with 53 parts (0.336 mole) of 2-cl1loro-1- methyl-N,N-dimethylethylarnine hydrochloride contain-- ing 53.8 parts (0.336 mole) of 25% caustic soda solution. The procedure followed again was that described in Example 1. An amber oil was obtained possessing the same solubility characteristics; as mentioned in the previous example. Analysis gave 9.75% nitrogen. and

21.87% sulfur as compared to 9.45% nitrogen and 21.63% sulfur calculated for C H N OS Example 21 6 ethoxy 2 (2 diethylaminoethylthio)benzothiazole of the structure CSCH2CH:N(C;H5)2

sulfur as compared to 9.02% nitrogen and 20.66% sulfur" The hydrochloride of this" compound was a cream colored" solid melting at calculated for C H' NOS-g.

' 146 C. M.P. (HOOC) .2H O salt 68--70"C.'

.to 23.89% calculated for C H N OS Example 22 Cl uO S C SOHZGHINHLZHQO may be used as an intermediate to prepare the compound of Example 19 'by condensation with formaldehyde and formic acid. The intermediate was obtained by reacting 42.2 parts (0.2 mole) of 6-ethoxy 2-mercaptobenzothiazole in 200 parts of water containing 32 parts (0.2 mole) of 25% caustic soda solution with 41 parts (0.2 mole) of 2-bromoethylamine hydrobromide containing 32 parts (0.2 mole) of 25% caustic soda solution. The mixture of reactants was well agitated and heated to 70-80 C. for about 24 hours and thenallowed to cool to room temperature. To the stirred mixture 300 parts of diethyl ether were added'and stirring continued for about a half hour. Thereupon the precipitate was separated by filtration, washed with water until neutral to litmus and air dried. The crystalline product melted at 1'38-140" C. and on analysis was found to contain 9.54% nitrogen as compared'to 9.65% calculated for C H N OS 2H O.

Example 23 6 ethoxy 2 (3 dimethylaminopropylthio)benzothiazole of the structure Example 24 I 2 (3 aminopropylthio) 6 ethoxybenzothiazole of the structure om o s CSCHzCHzCHaNHI was obtained by reacting 52.8 parts (0.25 mole) of6- .ethoxy mercaptobenzothiazole in 500 parts of water containing 40 parts (0.25 mole) of 25% caustic soda tion with 54.8 parts (0.25 mole) of solu- H'Br in 40 parts (0.25 mole) of 25 caustic soda solution. The procedure followed that in Example 6. An amber oil was obtained analyzing 23.42% sulfur as compared In spore germicompound excellently controlled nation tests the Stemphylium sarcinaeforme and Monilinia fructicola although it was without rust eradicant properties.

' Example '25 6 ethoxv- (2 dibutylaminoethylthio)benzothiazole of the structure olmo s cscmommmm):

was obtained by reacting 40.8 parts (0.193 mole) of 6- ethoxy Z-mercaptobenzothiazOle in 250 parts of water containing 31 parts (0.193 mole) of 25% caustic soda solution with 44 parts (0.193 mole) of N-(2-chloroethyl) dibutylamine hydrochloride in 31 parts (0.193 mole) of 25% caustic soda solution. The reaction mixture was heated at 5 060 C. for 3 hours, cooled and extracted with 350 ml. of chloroform. The chloroform solution was washed with water until the washings were neutral to litmus and dried over sodium sulfate. The chloroform was removed in vacuo at a maximum temperature of 80-90 C. at 1-2 mm. The dark amber oil'so obtained analyzed- 7.67% nitrogen and 17.70% sulfur as compared to 7.64% nitrogen and 17.49% sulfur calculated for m ao a z- CLASS 4.HYDROCARBON SUBSTITUTED BEN- ZENE NUCLEUS Example 26 i 2 (2 dimethylaminoethylthioj- 6 phenylbenzothiazole having the structure was obtained by reacting 48.6 parts (0.2 mole) of 6- phenyl mercaptobenzothiazole in 500 parts of water containing 32 parts (0.2 mole) of 25% caustic soda solution with 28.8 parts (0.2 mole) of 2-chloro- N,N-dimethylethylamine hydrochloride in 32 parts (0.2 mole) of 25 caustic soda solution. 1 The mixture was heated to 50-60" C. with stirring for about 3 hours and then cooled to about 10 C., filtered, and the residue washed with water until the Wash waters were neutral to litmus The tancolo'red solid was then air dried at room temperature and 'was found to have a meltingpointof 41-43 'C. The crystals were insoluble in. water, ether and heptane, soluble in acetone, benzene, clfloroform andethanol but only slightly soluble in ethyl acetate. Analysis gave 8.79% nitrogen and 19.87% sulfur as compared to 8.91% nitrogen and nitrogen calculated for C17H18N2S2.

Example 27 2 N,N dimethylaminoethylthio 6,7 dihydro 4,5- benzobenzothiazole of the structure to about 25 C. and extracted with 500 parts of ethyl.

ether.; The ethereal solution was washed with water until the washings were neutral to litmus, then dried over anhydrous sodium sulfate and the ether removed in vacuo. The yield of the product, an amber colored oil of the formula set'forth above, was 82.5% of theory. Analysis gave 9.42% nitrogen and 22.14% sulfur compared to 9.65% nitrogen and 22.08%' sulfur. calculated for 15 18N2Sm Elli Example 28 4 methyl 2 (2 dimethylarninoethylthio)benzothiazole of the structure was obtained by reacting 45.3 parts (0.25 mole) of 4- methyl mercaptobenzothiazole in 500 parts of water containing 40 parts (0.25 mole) of 25% sodium hydroxide 112 In this connection mono salts form from oxalic acid. Analysis showed that the oxalates described in Examples 3, 13 and 21 were mono salts.

Further examples of new compounds are summarized in the table below. All these compounds may be represented by the general formula MSCH CH A where M is the thiazolyl radical and A the amino substituent. In the table, under the heading of M,

B represents the 2-benzothiazolyl radical,

S-C represents the 5-chloro-2-benzotbiazolyl radical, 6E represents the 6-ethoxy-2-benzothiazolyl radical and 4-E represents the 4-ethoxy-2-bcnzothiazolyl radical.

TABLE Analysis Example Yield,

No. M A per- M.P

cent Found, Galcd, percent percent so 5-0 N[CH(CH3)9]1--.- 91.5 12-79" ag a1 s-E niomo mnm 7- t 131% 1513 32 B N,[CH(CH;) 95.5 do N 9.5 9.5 33 B NHG(OH;) 95.0 d g Q2 94 -0 NHowrn 91.0 hat-195 a5 6-E NHO(CH;)3 69.0 amber 011...- N 9.0 9.0 39 4-15 Mom): 81.6 g 2:2 31 en NHC(CH5)9 71.0 do g 3:3 8:? as 4-19 N(C9Hs)2 71.5 15 g 3:9 39 B NHOH(GH3)2,.-- 92.0 .-do N 11.2 11.1 40 6-E NHCH(CH;)r.. 68.9 do N 9.3 9.5

solution with 36 parts (0.25 mole) of 2-chloro-N,N-di- 6-amino-2-(2-diethylaminoethylthio)benzothiazole of methylethylamine hydrochloride in parts (0.25 mole) the structure of 25% sodium hydroxide solution. The reaction procedure followed was the same as that followed in Ex- HSN s. ample 1. The product obtained was an amber oil with 2 s): solvent characteristics common to the family of products 1 described. Analysis of the product gave 11.08% nitrogen 40 and 25.20% sulfur as compared to 11.10% nitrogen and 25.41% sulfur calculated for C I-1 N 5 Example 29 2 (2 diethylaminoetbylthio) naphtho [2,3lthiazole of the structure was obtained by the procedure of Example 1 but employing as a reaction charge 54.4 parts (0.25 mole) of 2- rnercapto naphtho[2,3]thiazole dissolved in 500 parts of water containing 40 pats (0.25 mole) of 25% caustic soda and 43 parts (0.25 mole) of 2-chloro-N,N-diethylethylamine hydrochloride in 40 parts (0.25 mole) of 25% caustic soda solution. The product was an amber oil analyzing 8.87 nitrogen and 20.11% sulfur as compared to 8.85% nitrogen and 20.26% sulfur calculated for 1'I 20 2 2- Further examples belonging to the aforesaid classes were prepared following the methods heretofore outlined. The reactions were effected by adding an aqueous solution of the 2-chloroethylamine to a stirred aqueous solution of the sodium salt of the mercaptothiazole and stirring at room temperature. The solid reaction products (Examples 30 and 34) were then filtered from solution, washed and dried. Where the product was liquid it was extracted from the aqueous reaction mixture by a water immiscible solvent, as for example ether, the ether solution washed thoroughly and the ether'removed in vacuo. The temperature of the residue was kept below about 90 C. during the removal of the solvent to yield the free base. Where desired the base may be converted to a. salt.

was prepared but it lacked significant fungicidal properties. The compound was an amber oil analyzing 14.75% nitrogen and 22.92% sulfur as compared to 14.93% nitrogen and 22.79% sulfur calculated for C I-1 9N 5 Similarly, 2 (Z-diethylaminoethylthio)-6-nitrobenzothiazole having the structure OgN S was prepared and also found to lack significant fungicidal properties. A solid product was obtained which, after recrystallization from ethyl alcohol, melted at 7l -72 C. Analysis of the product gave 20.48% sulfur as compared to 20.59% calculated for C H N O S This compound was toxic to plants, especially bean plants on contact with the foliage at 0.5% concentration.

From the plurality of examples set forth it is apparent that a wide range of products fall within the range of the invention, since more than one substituting group of the number shown, and also of other, may be inserted in the benzene nucleus and other halogen alkyl derivatives, than methyl and ethyl derivatives of ethyl amine are useable.

The utility of the products disclosed herein as fungicides is well illustrated by the. following examples of application as effective in the control of wheat rust.

In demonstrating the effectiveness as fungicides, a rust susceptible variety of wheat (Seneca) was planted in small clay pots filled with soil. About ten seeds preferably are normally planted in each pot so to insure availability of about five uniform plants for the test. The pots are then held in a greenhouse at about 75 F. and watered daily until the seedlings are six days old. Thereupon the seedlings were sprayed with water by means of an atomizer and bloom was removed from the leaves by gentle rubbing. Then rust spores of the organism Puccinia rubigo-vera-tritici were transferred to the leaves which were well infected by rubbing the spores up and down the leaves on both sides thereof. Following inoculation, the plants were sprayed with a fine mist of water and placed in incubation chambers where they are held for 36-48 hours at approximately 70 F. with humidity 100%. Four days after inoculation with rust spores, theplants were sprayed with solutions of the chemical product under test. The solutions were prepared in concentrations of from 1 to 5 parts of the various chemicals to 1000 parts of water, which may contain a small quantity (5 parts) of acetone, or other solvent, if the chemical is not soluble in water. A small quantity of a suitable spreading or wetting agent preferably is also present. The compounds may be applied in the form of emulsions or even wettable powders as well as dispersions and solutions.

The infested plants are sprayed in duplicate tests using cc. of the test solution per pot. After treatment as described, the pots are held in the greenhouse for a week and then examined and graded as to the number and size of pustules formed on the leaves. Tested in the manner described, and employing the products of Examples 1, 2, 3, 4, 9, 11, l2, 13, 14, 16, 17, 18, 19, 20, 21, 23, 25, 26, 27, 28 and 29, which are taken as products exemplifying the invention, and using concentrations of the test agents varying from 0.1 to 0.5% by weight (1 to 5 parts per 1000), good results as controllers and eradicants of wheat rust were realized. Also there was from none to very slight injury of the leaves of the plants so the products are not phytotoxic as well as being good fungicides. The compounds comprise efiicient nematocides, outstanding examples being the products of Examples 1, 12 and 20.

It is intended to cover all changes and modifications of the examples of the invention herein chosen for purposes of disclosure which do not constitute departures from the spirit and scope of the invention.

What is claimed is:

l. The method of protecting from fungi which comprises applying to the area to be protected a composition containing as the essential active ingredient in effective concentration a thiazole of the composition [(MXE),,A] where M represents a thiazole nucleus in which vicinal carbon atoms are part of a carbocyclic radical containing aromatic double bonds, said carbocylic radical containing at least six but not more than twelve carbon atoms and selected from the group consisting of hydrocarbon, lower alkoxy substituted hydrocarbon and halogen substituted hydrocarbon carbocyclic radicals, X represents a member of the group consisting of oxygen and sulfur, E represents an alkylene radical containing at least two but not more than three carbon atoms, A represents an amino radical selected from the group consisting of NH mono lower alkylamino, di( lower alkyl)amino and amino radicals in which the nitrogen is part of a heterocyclic ring and y and z represents integers from 1 to 2.

2. A fungicide composition comprising a carrier and a small amount sufficient to exert toxicity to cereal rusts of 5-chloro-2-(Z-dimethylaminoethylthio)benzothiazole.

3. A fungicide composition comprising a carrier and a small amount sufficient to exert toxicity to cereal rusts of 5-chloro-2- Z-dimethylaminoethylthio benzothiazole.

4. A fungicide composition comprising a carrier and a small amount sufiicient to exert toxicity to cereal rusts of 6-ethoxy-2-(Z-dimethylaminoethylthio)benzothiazole.

5. A fungicide composition comprising a carrier and a small amount suflicient to exert toxicity to cereal rusts of 6-ethoxy-2-(Z-dimethylaminoethylthio)benzothiazole.

6. A method of treating wheat to control wheat rust which comprises treating the growing wheat with a com- 14 position containing as the essential active ingredient a thiazole of the composition where M represents a thiazole nucleus in which vicinal where M represents 5-chloro-2-benzothiazolyl and R and R represent lower alkyl groups.

8. A method of treating wheat to control wheat rust which comprises treating the growing wheat with a composition containing as the essential active ingredient a thiazole of the composition where M represents 6-lower alkoxy 2-benzotbiazolyl and R and R represent lower alkyl groups.

9. A fungicide composition toxic to the causative agent of wheat rust comprising a carrier from which an active mercaptobenzothiazole component is released upon evaporation having dispersed therein an efiective concentration of a mercaptobenzothiazole compound having the structure wherein M represents a chloro substituted 2-benzothiazolyl radical, E represents an alkylene radical containing at least two but not more than three carbon atoms and R and R represent lower alkyl groups.

10. A fungicide composition toxic to the causative agent of wheat rust comprising a carrier from which an active mercaptobenzothiazole component is released upon evaporation having dispersed therein an effective concentration of a mercaptobenzothiazole compound having the structure wherein M represents a mono lower alkoxy-Z-benzothiazolyl radical, E represents an alkylene radical containing at least two but not more than three carbon atoms and R and R represent lower alkyl groups.

11. A fungicide composition toxic to the causative agent of wheat rust comprising a carrier from which an active mercaptobenzothiazole component is released upon evaporation having dispersed therein an etfective concentration of a mercaptobenzothiazole compound having the structure wherein M" represents 5-ch1oro-2-benzothiazoly1 and R and R represent lower alkyl groups.

12. A fungicide composition toxic to the causative agent of wheat rust comprising a carrier from which an active mercaptobenzothiazole component is released upon evaporation having dispersed therein an effective concentration of a mercaptobenzothiazole compound having the structurev References Cited in the file of this patent UNITED STATES PATENTS Messer Mar. 26, 1935 Coleman Aug. 6, 1935 Clifiord July 13, 1937 Mathes Nov. 12, 1940 Kurlychek Sept. 19, 1944 Jones et al Sept. 19, 1944 Flenner et a1 Nov. 19, 1946 Jones et al. July 15, 1947 Steiger Oct. 26, 1954 OTHER REFERENCES McNeW: Agr. Chem., vol. 7, April 1952, pp. 5456,

UNITED STATES PATENT OFFICE. CERTIFICATE 0F CORRECTION Patent No. 2,912,357

November 0, 1 1959 Column 3, line '30, for "C H S 1." read C H N S column 5, line 44, for "produce" read product 'line 59, for "300 parts" read 30.3 parts column 6, line 38, for "hydrochlorine" read hydrochloride line 64, for "nintrogen" read nitrogen column 11, line 61, for "C H H S read--' C H N S column 13, line 67, for "5-@chloro---2- (Z-dimethylaminoethylthio)benzothian'ole." read 5-chloro-2- (2-diethylaminoethylthio)benzothiazole.. line '73, for "6-=-ethoxy-2-(2-=- dimethylaminoethylthio)benzothiazole'" read 6--ethoxy-2-(2-diethylamino=- ethylthio)benzothiazole column 14, lines 19 to 21, the composition should read as shown below instead of as in the patent:

lines 30 to 32, the composition should read as shown below instead of as in the patent:

1 M 'S-C H N 'signed and sealed this 26th day o Ap 1969 (SEAL) Attest:

KARL H; AXLINE ROBERT c. WATSON" Attesting Officer Commissioner of Patents 

1. THE METHOD OF PROTECTING FROM FUNGI WHICH COMPRISES APPYLING TO THE AREA TO BE PROTECTED A COMPOSITION CONTAINING AS THE ESSENTIAL ACTIVE INGREDIENT IN EFFECTIVE CONCENTRATION A THIAZOLE OF THE COMPOSITION ((MXE(YA)Z WHERE M REPRESENTS A THIAZOLE NUCLEUS IN WHICH VICINAL CARBON ATOMS ARE PART OF A CARBOCYCLIC RADICAL CONTAINING AROMATIC DOUBLE BONDS, SAID CARBOCYCLIC RADICAL CONTAINING AT LEAST SIX BUT NOT MORE THAN TWELVE CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON, LOWER ALKOXY SUBSTITUTED HYDROCARBON AND HALOGEN SUBSTITUED HYDROCARBON CARBOCYCLIC RADICALS, X REPRESENTS A MEMBER OF THE GROUP CONSISTING OF OXYGEN AND SULFUR, E REPRESENTS AN ALKYLENE RADICAL CONTAINING AT LEAST TWO BUT NOT MORE THAN THREE CARBON ATOMS, A REPRESENTS AN AMINO RADICAL SELECTED FROM THE GROUP CONSISTING OF NH2, MONO LOWER ALKYLAMINO, DI(LOWER ALKYL) AMINO AND AMINO RADICALS IN WHICH THE NITROGEN IS PART OF A HETEROCYLIC RING AND Y AND Z REPRESENTS INTEGERS FROM 1 TO
 2. 